implement new network interface (tcp:ip) to beam logs to scotty

[KonstantinGasser]

Currently scotty only supports streaming of logs via unix sockets. However it would be useful if the command beam could also stream logs via a tcp:ip connection.

Background is:
when the application is running in a docker container streaming through unix sockets is hard but it is easy to use a tcp socket.

This feature should be relatively straight forward as the current multiplexer is using net.Conns. However cmd flags need to be implemented. Furthermore, an alignment in the beam repository changes are required. Please refer in your PR to also a PR in the beam repository.